First, if you're going to give a real "deep" massage, it is very important to warm up the muscle before you actually start working it. Let's say you are going to massage the upper trapezius. You would first start with some lotion and do effleurage, or rub your hand up and down the muscle. This promotes blood flow to the area and warms up the muscle.
Once the muscle is warmed up, you have some options as to what to do. One thing you can do is "frictioning". You want to take off most of the lotion
หมวกกันน็อค (using a towel or cloth), place your hands on the skin above the muscle and MOVE THE SKIN AROUND OVER THE MUSCLE. With the right pressure this is going to provide a deep massage to the tissue working out knots as well as break adhesions between the skin and subcutaneous tissue. You can do this in a circular motion one round, cross section (opposite to the course of muscle fibers), or longitudinal (with the muscle fibers). If doing cross-section frictioning, it's important to not "twang" the muscle by slipping off which is very uncomfortable and painful but keep your hands on the muscle. This can be diffcult for some muscles (erector spinae) at first, but with practice is very therapeutic. It is important to make sure your hands are not sliding on the skin and you are actually moving the skin around.
Another thing you can do is called "Open C's". This is typically done with some lotion and the goal is to lightly pull the muscle up off of where it rests. This would be more difficult on muscles like the erector spinae, but is more practical for muscles like at the calf or upper traps if still working on the neck.